Leather-skiving machine.



E. F. DAVENPORT.

LEATHER SEWING MACHINE.

\ APP IOA ON FILED JULY 1",, 1909 Patented Dec. 22, 1914.

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EUGENE F. navmironr, or MELROSE, iuassaonnsn'rrs, ASSIGNOB. T UNITEDsnon MACHINERY a r-Means. or raennscn, NEW zrnnsny, A CORPORATION or NEWJERsEYi LEATI-IER-SKIVING 'MACHINE Specification bf Letters Patent.Patented D 22 191 4 Application filed July 17, 1909. Serial No. 508,136.

ToaZZ-w/lom it may concern Be it known that I, Er or-mi: F. DAYEN-- Pom,a citizen of the United States, residat Mclrose, in the county ofilliddlesex and State of Massachusetts, have invented .machine and isintended primarily for use.

1 in machines of the type disclosed in an apchines at this plication forUnited States patent filed-bf. George Warren, Serial No. 1815 117, datedMarch 3, 1909. It is to be understood, however that while the inventionparticularly adapted for use iii-machines of the class disclosed in saidapplication, the invention is also applicable to other forms of leatherskiving machines. I

in the skiving machine aboi'e referredto the pieces of leather to beskived are fed to a rotary cylindrical. knife by means of a feed rollcooperating with a presser foot.

It is essential that the edge of this knife be.

maintained sharp so that the leathervmay be sliiveejl to a very thinedge. Heretoiore maeral class have been promonnted so to be capable o- Ait into engagemei'it with the outer r l of the knife. This grinderleaves a bur the edge of the knife 'and it has been customary to removethis hur by means of an oil stone held in the the operator being cut theknife.

hand'of the operator. This method of relmoving the bar is ob ectionabletor the reason thatthe knife is not readilyaccessible and for the reasonthat there isdanger of Another objection to this method of removing thebur is that the whet stone is not always manipulated properly by theoperator so that the edge of the knife is not left 1n a condition to dosatisfactory Work.

The object of the present invention is to provide a sharpening and burremovingde vice which will be free from the ob ections above noted,which will be simple and compact in construction, and will perform thedesired operations in a satisfactory manner. With this object 111' Viewthe present incnd elevation.

ven'tioncontemplates the provision of: an oil ting edge of thevknife,and mechanism for moving the stone into and out of operative.

relation with the knife edge and for permanently supporting the stonewith its Working face positioned in parallel relation to theinterior.surface of tlie'knife.

In theprelerredfornr of the present in-' vention,.certain novel cmstructions and arthe lie-companyin drawings.

in the drawings l i'gurel is a partial sectional s de elevation.v Fig. 2is a partial sectional plan 'v1ew', and Fig. 3 is asectional its-showninthe-dranungs the machine comprisesa'base l' the left hand orfront end2 01' the top 0t which forms av \vork table I upon which an edge gagelis adjustably I mounted. A presser foot 6 18 mounted ina head 8 andadapted to cooperate with a .feed roll 10 directly below thefsame tofeed The feed roll is the material to be skived. rotatahl supported byan arm 12 which projects laterally from a sleeve ll rotatably mountedonla rod 15 which" is supported'in the base of the machine. Thesleevell. is surrounded by a coiled spring 16' which is attached atoneend to a lug 18 on the sleeve and at the otherend to a collar 19 pinnedto the rod 15. Thus the feed roll is yieldingly pressed upwardagainst'the material to be SkliQCl. l knob 20 is connected by means of arod 21 to a depending arm 22 on the sleeve ll, by means of which feedroll may be manually lowered to allow the operator to inor Whetstonesupported adjacent to the cutsert the material between the feed roll andpresser foot. The feed r ll is rotated by.

means of a rod 2 having a universal joint at each end and connecting theroll with a' shaft 21'') provided. Witha spiral gear 27 meshing with asimilar gear'2S on a shaft 29 connected to any suitable source of power.

.Thefeed .roll is mounted to rotate near thee'dge and Within thepcriphe'y of a cylindrical skiving knife 30. i

' The knife 30 is secured to the flanged end 32-01? ashaft 34: journaledto rotate in a sleeve 36 mounted in a frame 37 supported by the base ofthe machine. The shaft 34:

- the-present is rotated anytsuitable means. 7 For sharpening the edge38 of the knife a' rotary grinding diski is provided which is mountedupon the upper end of a: shaft 42 j'our'naled .ina b( ss 4% formed ingarmed A grooved pulley 47 is mount on one endof a swing ed onthe lowerend oftheshaft 42' and is driven by'a belt source of po'wer.;:Aiscrew-threaded rod 48 connected with the 50 "is pivotally connected atone end-to the arm 46 by a p n '51' and" projects through 1 the side ofthe base 1 to cooperate with a long Sleeved nut 52 by means of which.the 0 position of the grinding disk may be varied. If desireda spring(not shown) may be connected to t eiarni 4:6 to draw the, disk knifewhen the 'nut" 52 is 1111-" against the screwed. The .parts' of "themachine 'so' far describedare the same in construction and -mode ofoperation as the corresponding 1 cylinder.

parts of'the machine disclosed in.theapplication ,hereinbefore referredto.

The construction illustrated in the draw-' ings as embodying, thepreferred for m of invention comprises an. oil or whet stone This stoneprojectsinto the interior of the rotary knife and is mounted in a holderor boss 61 provided with a clamping or setscrew 62 and mounted upon 'anarm 6i pivoted at 65"to a bracket 66 attached to; the side of an arm 68secured to the frame 37 and projecting below the knife. The plane of'movement of the arm I 64. into and" out of operative position isparallel-to the-plane of the cutting edge of the knife and the stone issecured in the arm normally to this plane softhat with this constructionthe working face of the stone is permanently positioned in parallelrelation to the"interi 0r. surface of the knife.

-' rod 69 is pivotallyfa-ttached-at one end to the" arm Standprojects'through the base 1 the outer end of the rod being providedwitha knob -70. A spring 72 surrounds the rod 69and is interposedbetween theoutside of the base 1 and the innerend of the knob .allow thegrinding disk 60. in the form of an elongated v 70. This spring ant tokeep at state 60 thenut' '52. is unscrewed-to the grinding operationisremoved by the stone 60'which is brought into contact-with theinterior of the knife, by pushing the knob against the tension-"of thespring 72. Upon releasing the knob the stone is automatically Withdrawnfrom contact with the knife. I

The invention having been described, what .is claimed is:-

1. A leather skiving machine, having, in

combination, skiving kn1fe, a grinding disk'arranged to be movedat'interva'ls into contact with the a substantially cylindrical exteriorbeveled surface of the knife to sharpen the cutting edge,- a Whetstoneprojecting within the knife, and mechanism for moving the stone into andout of operative relation'with the knife edge and for permanentlysupporting the stone with its working face positioned in parallelrelation to the interior surfaceof the knife andexe tendingsubstantially in the direction of the axis of the knife.

\ A leather skiving machine, having, incombination,

exterior surface of the knife to sharpen the cutting edge, an armarranged to move in a plane parallel to the planeof the cutting edge,and a Whetstone sec'ure'd the arm and projecting within the knife normalto'the plane of the movement of the arm and; with its Working faceparallel to the interior surface of the knife.

.EUGENE F. DAVENPORT. Witnesses:

\VARBEN' G. OGDEN,

ALFRED H. HILDRETH.

a cylindrical skiving knife, 9. I grinding disk arranged to contactwithj-the-

